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Gonyaulacysta parorthoceras
Gonyaulacysta parorthoceras Davey 1968
Now Cribroperidinium?. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Cribroperidinium?.
Holotype: Sarjeant, 1966, pl.14, figs.5-6, text-fig.29 (as Gonyaulacysta orthoceras); Jan du Chêne et al., 1986, pl.26, figs.6-8
Locus typicus: Speeton Clay, West Heslerton, England
Stratum typicum: Late Barremian
Original diagnosis: Davey, 1968, p.1
Shell ovoidal with strong, tapering apical horn accounting for about one-fifth to one quater of overall length. Shell wall of moderate thickness, granular to tuberculate. Tabulation 4", 1a, 6"", ?6c, 7""", 1p, 1""""; crests low, bearing small spinelets. Cingulum strongly spiral, of moderate breadyh: sulcus broad and extending to antapex.
Now Cribroperidinium?. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Cribroperidinium?.
Holotype: Sarjeant, 1966, pl.14, figs.5-6, text-fig.29 (as Gonyaulacysta orthoceras); Jan du Chêne et al., 1986, pl.26, figs.6-8
Locus typicus: Speeton Clay, West Heslerton, England
Stratum typicum: Late Barremian
Original diagnosis: Davey, 1968, p.1
Shell ovoidal with strong, tapering apical horn accounting for about one-fifth to one quater of overall length. Shell wall of moderate thickness, granular to tuberculate. Tabulation 4", 1a, 6"", ?6c, 7""", 1p, 1""""; crests low, bearing small spinelets. Cingulum strongly spiral, of moderate breadyh: sulcus broad and extending to antapex.